Track belt for motor vehicles



July 3, 1923. I i mosA A. KEGRESSEl TRACK BLT FOR MOTOR'VEHICLE'S 4Filed March 5o. 19214 FUJI?,

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Patented July 3, 1923.

UNITED s'iars 'fl-I FCE.

l ADOLPHE KGRESYSE', OF PARIS, FRANCE. I

TRACK BLT FOR MOTOR VEHILES.

applicati@ med maren so, 1921'. serial No. 457,110.

To allwwmitmyconcem.'

' Be it known that I,'Ar or.1 rm Konnssn, citizen of the Republic ofFrance, and resident of Paris, France, have invented a new and usefulImproved Track Belt for Motor Vehicles (for which I have filed anapplication in France on June 14, 1916,-Patent No. 482,034), whichimprovements are fully set forth in the following speciication. Y

Track belts used at present in motor vehicles mostly consist of metalbands composed of a series of links of ymoreor less complicatedconstruction. These metal belts of whatever type they may be, havenecessarily no great degree of suppleness;

-lfurther they are also necessarily noisy,

heavy, without any elasticity and it is not "an easy matter to drivethem. lAll those' drawbacks do not allow of suchbelts being-used on'.vehicles which have toA be run lso at a more than moderate speed.

The present invention has for the provision of an' improved belt inwhich all of the foregoing objections have been overcome.v

The invention will now be described with reference to the accompanyingdrawingswhich illustrate oneform of the improvedv track belt. In thesedrawings: i) ig. 1 is a side elevation of a part of the Fig. 2 is across section on the line A of Fig. 1. l' y Fig. 3 is a plan of aportion of the improved belt.V j

The improved belt is composed of rubberized fabric. It comprises two datportions 1, 1 constituting the base of the belt, a central portion 2composed of' a series of rectangular 'blocks having a semi-conical shapein one direction (that shown in Fig. 2), and conical (shown in Fig. 1),two continuous projecting tread portions, 3, 3, made of rubber, and'suitable soil-gripping projections 4 (Fig. 3) more particularly suitablefor use on soft ground.

' Each of the parts 1, 2, 3 and 4 is designed to elfect a separate anddefinite result.

- The' improved belt rests with its fiat portions 1, 1A on the drivingWheels. These flat portions also engage with the guide rollers thatdistribute the load over the driving stretch .of the belt.

` vThe blocks '24 are designed to guide the 'its' object in the otherdirectionbelt and to prevent vit from slipping off the 'driving wheels,which are provided with 'suitable grooves, in the turning movements ofthe vehicle. These blocks v2 are semiconical as shown in Fig., 2, inorder to prevent the belt from being cut through at the points a, a, ifthe belt should happen to pass with its centre over a hard body such asa stone, represented in Fig. 2.by an arrow b.

In such a casethe conical parts c, c whichv have a tendency to entermore deeply into the grooves of the driving wheels or .pulleys, bearnormally against lthe inner sides of the said wheels orpulleys and thusavoid the cutting above referred to.l Further, the wheels or pulleyswhich are shapedto correspond with the shape of the belt, facilitatebyvreason of their conical groove, the entry of the blocks 2. Theseblocks have another conical face for the purpose of ensuring thesuppleness of the 4belt mainly during the passage of the latter over thewheels or pulleys, as shown in Fig. 1.

The-blocks' thus formed may also allow of driving lthe belt directly,vby toothed wheels. I

The projecting tread portions 3 act in a i certain way as rails; theyensure the con- -tinuity of the rolling motion `no`twith standing thevariously shaped driving projections fixed between them. Further, theyform an elastic buffer between the ground and the bearing parts ofthewheels or pulleys and rollers; and since they are disposed opposite theplane portions 1 of the inner surface of the belt, over which the saidrollers travel, the latter will have a tendency to press them againstthe ground, as will be' understood.A -On hard ground such as a road forinstance, they preventthe outer, dat

portions from being prematurely worn out.

The purpose of the projections 4 is ob-A vious; they serve toprovideagbearinglupon soft ground. In ,fact when the lowery horizontal surfaceof the tread portionsand the projections is not sufficient to grip theground over which the vehicle istravelling, the belt will sink in untilthe fiat portions also take their share in bearing the load. In thiscase the projections leave upon the ground impressions which willprevent the belt from slipping.

cross-section, said parts having a gra The parts 5 (Fig. 2) L of theseprojections are 4'of special sha in aan? .11.0"

increasing thickness or curvature starting? fromitlie outer edges vofAthe belt'and conff tinuing up to the projections 3. This detail is ofimportance because it allows of the belts side-slipping over the groundin the Y .turning movements of the vehicle.

havingr on each side of said lineof blocks a continuous,` plane portionfor engagement... by the guide rollerswhich distribute the load over thedriving strtdh of the belt, and

having on its outer 'surface continuous, integral tread projectionsforming track rails and integral ground-gripping projections,

the rail-forming projectlonson the outer surface of the belt beinglocated opposite the plane portions of the inner surface.

2. A track belt for automobiles, comprising an endless band ofrubberized fabric having on its inner surface an endless line of theinner surface.

.specification in ythe Leccese of integral blocks spaced midway betweenthe .edges thereof and adapted to engage the peripheral 'surfaces of thedriving wheels.

around which the belt is to pass, so as to guide thebelt in itsmovements; said belt having on each side of said line of blocks acontinuous, plane portion for engagement by the guide rollers whichdistribute the load over the driving stretch of the belt, and having onits outer surface two continuous, integral ribs disposed in spaced,parallel relation and forming track rails, and integral,transversely-arranged ground-gripping pre- -jections disposed betweensaid track rails and intersecting the same, the rail-forming projectionson the outer surface of the belt plane portions.

being located opposite the In testimony whereof I have signed thispresence fof two subscribing witnesses.

' ADoLPHE KGREssE. Witnesses: y,

FERNAND DUF0UR, lCHARLES LEON LAISEL.

